1PC/3PCS 4-32mm 4-20mm 4-12mm HSS Cobalt Step Drill Bit Nitrogen Spiral Grooved Hole Cutter

Description 1PC or 3PCS 4 32mm 4 20mm 4 12mm HSS Cobalt Step Drills Nitrogen High Speed ​​Steel SpiralSpecification Material High Speed ​​Steel 4241Surface Nitrogen treatmentNotch Type Spiral NotchShank Triangle ShankSizes 1 4 32 mm in 15 steps 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 mm 1 4 20 mm in 9 steps 4 6 8 10 12 14 14 18 20mm 1 4 12 mm in 5 steps 4 6 8 10 12mm Application for Drilling Carbon Steel Sheet Iron Insulation BoardsFeatures ● The most popular job that uses step drill bits is sheet metal working ● People also use step drill bits on auto repair projects and apply them as countersinks ● The Migiwata step bits come to a point and are thus self starting No need to use center punch ● They are more durable and not prone to break compared with twist drills Quantity 1pc 4 32mm or 3pcs set optional Warning 1 Due to manual measurement please allow a bit error thank you2 Due to shooting problems such as light there will be chromatic aberration please be careful More Details